Web Reference: Jul 8, 2025 · Functions are one of the fundamental building blocks in JavaScript. A function in JavaScript is similar to a procedure—a set of statements that performs a task or calculates a value, but for a procedure to qualify as a function, it should take some input and return an output where there is some obvious relationship between the input and the output. To use a function, you must define it ... Function Object Methods & Properties. Well organized and easy to understand Web building tutorials with lots of examples of how to use HTML, CSS, JavaScript, SQL, Python, PHP, Bootstrap, Java, XML and more. JavaScript Functions Summary: in this tutorial, you will learn about JavaScript functions and how to use them to structure the code into smaller and more reusable units.
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